OK, just took temp readings but first i think your thinking that i was talking about the raw water pump on the last reply. But i was actually speaking of the fresh water pump. There are no wear plates on the fresh main engine water pump. But after i asked about weather the impeller could have been installed incorrectly ie inside out, i looked at the manual again and it can't be installed in backwards, just that the tolerances were critical. I think it said 25 mm, 5 over or under was tolerable measuring with a straight edge across the housing. So back to temps, running at 190 0n the temp gauge the there housing read 150, the expansion tank 147, the heat exchanger 150 in 170 out, inner cooler 250 out and the temp out of the turbo 450 and 320 in. What do you think after temp readings?